CAJ | 학술논문

野外对临汾、太原盆地第四纪中晚期所发育的湖积地貌-沉积特征调查发现,湖盆在对应于S_8、S_5和S_1古土壤开始发育时期(时代分别为0.77 Ma BP、0.55 Ma BP和0.13 Ma BP)曾发生了三次强烈湖退,这_一次湖退都是构造原因所致的;而在L_(11)-S_8、L_8-S_5、L_5-S_1黄土古土壤堆积发育期间(时代分别对应于0.96-0.77 Ma BP、0.74～0.55 Ma BP和0.47～0.13 Ma aP)、以及S_1古土壤发育以后的时期(时代为0.07 Ma BP之后)出现的却足缓慢湖侵或盆地F沉.根据这些发现并结合地球物理学前期已获得的有关盆地深部上地幔结构及活动规律,本文提出了盆地湖侵-湖退过程的构造控制模式.在上地幔强烈上拱→减弱或渐趋稳定→再次强烈上拱的构造循环中,地表湖盆会以大幅快速湖退→缓慢湖侵→再大幅快速湖退这样的表现与之对应.盆地地表的地貌-沉积发育与地下的土地幔活动应具有因果关系.
야외대림분、태원분지제사기중만기소발육적호적지모-침적특정조사발현,호분재대응우S_8、S_5화S_1고토양개시발육시기(시대분별위0.77 Ma BP、0.55 Ma BP화0.13 Ma BP)증발생료삼차강렬호퇴,저_일차호퇴도시구조원인소치적;이재L_(11)-S_8、L_8-S_5、L_5-S_1황토고토양퇴적발육기간(시대분별대응우0.96-0.77 Ma BP、0.74～0.55 Ma BP화0.47～0.13 Ma aP)、이급S_1고토양발육이후적시기(시대위0.07 Ma BP지후)출현적각족완만호침혹분지F침.근거저사발현병결합지구물이학전기이획득적유관분지심부상지만결구급활동규률,본문제출료분지호침-호퇴과정적구조공제모식.재상지만강렬상공→감약혹점추은정→재차강렬상공적구조순배중,지표호분회이대폭쾌속호퇴→완만호침→재대폭쾌속호퇴저양적표현여지대응.분지지표적지모-침적발육여지하적토지만활동응구유인과관계.
The field work found that there existed three abrupt lake regressions in the Fenhe River Graben Basins during the middle-late Quaternary,which were consistent with the development of paleosols S_8,S_5 and S_1.This indicates that those regressions are not the results of the dry climate but due to the neotectonic movement.The basins experienced slow transgressions when the loess-paleosols between S_(11)-S_8,S_8-S_5 and S_5-S_1 developed,and sank after S_1 had formed.Based on these discoveries and previously revealed data about the activities of the upper mantle in the deep earth around this region,the paper puts forward a hypothesis that can explain how the lake transgression-regression cycles took place under the control of the neotectonic movement.The morpho-sedimentary characteristics are the results and responses of the activities of the upper mantle in the deep earth.